Method of and apparatus for making bags



Dec. 26, 1933. POTDEVlN 1,941,272

METHOD OF AND APPARATUS FOR MAKING BAGS Filed June 12, 1931 INVENTOR. (512% m A TTORNEYS.

Patented Dec. 26, 1933 UNITED STATES PATENT OFFICE Adolph Potdevin, Garden City, N. Y., asslgnor to Potdevin Machine Company, Brook] yn, N. Y.,

a corporation of New York Application June 12, 1931. Serial No. 543,850

6 Claim.

This invention relates to an improved method and apparatus for the making of bags, and has for one of its objects the provision of a method and apparatus wherein the web from which the bags are to be made is perforated, the perforated web then being tubed and the tube broken or divided along the perforations to provide successive bag lengths with a long flap at each end thereof, the flap at the bottom end of the bag length then being cut off and the bag bottomed, to provide a bag with a long flap at the filling end thereof, particularly useful in bags employed for mailing purposes, for example, where a long flap for sealing purposes is very desirable.

A further object of my invention is the provision of a method and apparatus for making bags which is particularly adapted for the making of cellophane bags or bags of similar fragile material, in that the material from which the bags are made, instead of being cut off in the usual way to provide a serrated edge, is perforated with minute perforations, the material then being broken along the line of the perforations to provide an edge which is practically smooth. While this is of advantage in the making of bags of any material -it is of particular advantage when employing material such as cellophane in that such material tears very easily if the edge is serrated but is strongly resistant to tearing from a smooth edge.

In the drawing accompanying this application:

Fig. 1 is a sectional elevational view of my improved apparatus;

Fig. 2 is a plan view of the perforating mechanism;

Fig. 3 is a view in plan of the apparatus by which the bag tube is broken or divided into bag lengths;

Fig. 4 is a plan view showing the web being tubed;

Fig. 5 shows a bag length with the bottom flap out off or shortened;

Fig. 6 shows the bag with paste applied to the bottom thereof;

Fig. 7 is a longitudinal section of a finished bag; and

Fig. 8 shows a finished bag in perspective.

Referring to the drawing in detail, 1 designates a supply roll from which the web of paper or other material is continuously drawn in practicing my invention.

2 designates a perforating roller and 3 a roller cooperating therewith in the perforating operation. The perforating roller 2 carries perforators designated 4, 5, 6, 7 and 8, the perforators 4, 6

and 8 extending longitudinally of the roller, the perforators 4 and 8 being in line with each other, while the perforator 6 is out of line with these two perforators, the perforators 5 and 7 extending peripherally of the roller from the inner ends of the perforators 4 and 8 to the outer ends of the v perforator 6.

9 designates a tank of adhesive and 10 a roller thereon for applying paste to one edge of the web 11 after the web has been perforated, the web passing around guide roller 12 on its way to the pasting station. The advancing web after having adhesive applied to one edge thereof is then passed around a guide roller 13 and through the tubing mechanism. As will be seen 7 from the drawing this tubing mechanism comprises a plate 14 extending lengthwise of the machine and about which the web 11 is folded to the position shown in Fig. 4 in the process of forming the tube. 7

Above this plate 14 and adjacent the left hand end thereof, as viewed in Fig. 1, is a. plate 15 slotted at 16 so that the same may be adjusted lengthwise of the machine. The plate 15 is recessed at its forward end as shown at 17. As the 30 web passes between the rollers 2 and 3 it will be perforated as shown in Fig. 4 the perforator 6 perforating the web transversely as shown at 18 intermediate the edges of the web, the perforators 5 and '7 perforating the web longitudinally as shown at 19 and 20, while the perforators 4 and 8 perforate the web transversely from the trailing ends of perforations l9 and 20 to the edges of the web as shown at 21 and 22, it being assumed that the web is moving to the left, as viewed in Fig. 4.

Beyond the end of the plates 14 and, 15 are feed rollers 23 and 24 one of which is provided with a bar 25 for holding the leading end of the tubing in the dividing operation.

26 designates vertically traveling chains carrying a striker 27 adapted to cooperate with the ends of the plates 14 and 15. It will be apparent that as the tube is advanced to the rollers 23 and 24 the bar 25 will grip the leading end of the tube which is being advanced by the feed rollers 28. Consequently when the striker bar 27 traverses the path of the tubing the tubing will tear or break along the perforations 18, 19, 20,

21 and 22 to produce bag lengths 29 with a flap 5 30 at the leading end and 31 at the trailing end.

Beyond the rollers 23 and 24 are two rollers 32 and 33 the roller 32 being provided with a knife 34, roller 33 being provided with a cooperating depression 35, this construction providing for cutting off or shortening the flap 30, as shown in Fig. 5. To dispose of the severed portion of the flap 30 any suitable mechanism may be employed. I have shown the roller 33 provided in its periphery with pins 36 which puncture the flap before the same is cut off so that when the flap is severed it is carried around with the roller 33 out of the path of the bag length, being finally wiped off the pins 36 by a member 3'! interposed in the path of the pins.

The bag length is then passed to rollers 38 and 39. The roller 38 carries a pasting or gluing block 40 and a bottom folding plate 41. The block 40 receives glue or paste from a gluing roller 42 which in turn receives its adhesive from the tank 43. The block 40 applies this glue or other adhesive to that part of the tube body against which the bottom is to be folded, as shown at 45 in Fig. 6, while the bottom folding plate 41 tucks the tube on a line 44 (Fig. 6) into the bottoming clamps on the lower folding roller 39. The flap 30 and the end of the bag are then folded over as shown in Fig. 7 to bottom the bag.- It will be seen from all of the foregoing that the present invention provides a method and apparatus for use in connection with the making of bags in which the web from which the bag is to be constructed is first perforated along the lines at which the web is to be divided into bag lengths, the web thereafter being tubed, broken at the perforations in the bag lengths to provide a bag length with a long fiap at each end, one of these flaps then being cut off and adhesive applied to secure the remainder of the flap in a folded-over position to the bag body to bottom the same.

It will be appreciated also that this method and apparatus are particularly well adapted for use in connection with making bags of material such as cellophane which is diflicult to handle and quite diflicult to cut in a bag making machine, the perforations employed by me providing a line of division which, when the material is broken off or the tubing divided into bag lengths, leaves a practically smooth edge, thereby reducing to a minimum tearing of the bag when in use.

What I claim is:-

1. In the making of bags, the method which comprises perforating a continuously advancing web at regular intervals, applying an adhesive to an edge of the moving web, folding the web to bring said edge into superimposed relation to the opposite edge of the web to provide a seam, dividing the advancing tubing into successive single bag lengths along said perforations, to provide a flap at each end of each bag length, and

' thereafter shortening one of said flaps and folding the same over the body of the bag length to close or bottom that end of the bag length.

2. In the making of bags, the method which comprises perforating a continuously advancing web, tubing the web, dividing the tubing at said perforations into successive single bag lengths with a flap at each end of the bag length, and thereafter shortening one flap and folding it over the end of the bag length to bottom the same.

3. In apparatus of the class described, the combination of web perforating mechanism for perforating an advancing paper web longitudinally and transversely, means for tubing the web after said perforating operation, means for breaking the tubing at said perforations to provide successive bag lengths with a flap at each end, and cutting off mechanism for shortening one of said flaps.

4. In apparatus of the class described, the cornbination of rotary web perforating mechanism for perforating a continuously advancing web longitudinally and transversely, tubing mechanism for tubing the perforated web, mechanism in the path of the tubing to break the tubing at said perforations into bag lengths with a flap at each end, and rotary cut off mechanism in the path of the bag lengths for shortening the flap at one end of each bag length.

5. In apparatus of the class described, the combination of rotary web perforating mechanism for perforating a continuously advancing web longitudinally and transversely, pasting and tubing mechanism for tubing the perforated web, fixed and movable mechanism for breaking the tubing at said perforations into bag lengths with a flap at each end, rotary cut off mechanism in the path of the advancing bag lengths to cut off one of said flaps of each bag length to shorten the same, and rotary means for disposing of the cut off portion of the flap.

6. In the making of bags, the method which comprises continuously advancing a bag tube, severing the tube into bag lengths with a projecting flap at each end said flaps being of equal lengths, thereafter shortening one of said flaps while the bag length is advancing and folding the shortened flap over the end of the bag length along the edge of the opposite wall of the bag length to bottom the same.

ADOLPH POTDEVIN. 

